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Q.

A pure Ge crystal has 3.0×1028 atoms/m3. It is doped by 1 part per 10 million concentration of trivalent Ga. The number density of electrons is (Given that  ni=1.5×1016/m3

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a

3x1021/m3

b

3.0 x1015/ m3

c

7.5 x1010/m3

d

1.5 x1021 /m3

answer is B.

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Detailed Solution

no of holes due to impurity nh=3 x1028107= 3 x1021 nenh=ni2

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